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CN101836386A - Communication device, multicarrier communication system, and communication method - Google Patents

Communication device, multicarrier communication system, and communication method Download PDF

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Publication number
CN101836386A
CN101836386A CN200880112914A CN200880112914A CN101836386A CN 101836386 A CN101836386 A CN 101836386A CN 200880112914 A CN200880112914 A CN 200880112914A CN 200880112914 A CN200880112914 A CN 200880112914A CN 101836386 A CN101836386 A CN 101836386A
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CN
China
Prior art keywords
receiving quality
quality information
channel
information
subcarrier
Prior art date
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CN200880112914A
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Chinese (zh)
Inventor
小野寺毅
浜口泰弘
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

An adaptive modulation and an adaptive scheduling in a communication control device are efficiently performed while suppressing total report amount of reception quality information. A communication terminal device (300) used for a multicarrier communication system in which a signal is received in a channel assigned by a communication partner among a plurality of channels, each of which is composed of at least one subcarrier, reception quality of the received signal is measured, and the reception quality information is reported to the communication partner includes a reception quality measurement unit (308) which measures the reception quality of each subcarrier and a reception quality information generation unit (309) which decides an assignment request degree of each channel to the communication partner, selects information amount for representing the reception quality information for each channel according to the assignment request degree, and generates the reception quality information represented by the selected information amount according to the measured reception quality.

Description

Communicator, multi-carrier communications systems and communication means
Technical field
The present invention relates to measure the receiving quality of each channel and its result notification is given communicator, multi-carrier communications systems and the communication means of communication counterpart according to received signal.
Background technology
Former studies is a kind of improves communication efficiency, promptly considered the total throughout of system or considered to receive the method for the essence transfer rate of wrong generation.For example, propose a kind of following method: wait index that transmission path state and receiving quality represent and the messaging parameter (non-patent literature 1) of selecting modulation mode or channel encoding rate, error correction coding mode, diffusivity, yard multiplexing number, transmitted power etc. adaptively based on power or SINR to received signal (Signal to Interference plus Noise power Ratio: received signal power is to disturbing and noise power ratio).Particularly, the mode of the modulation parameter of selecting modulation mode or channel encoding rate etc. is called as " adaptive modulation system " adaptively.
In addition, constituting with a plurality of communication terminals by base station apparatus and to communication terminal is communicated by letter (down link), utilizing in the communication system of multi-carrier communication, studying following method (non-patent literature 2, non-patent literature 3) from base station apparatus.
(1), carries out channel allocation is given the scheduling of each communication terminal according to the receiving quality of each channel in each communication terminal of down link signal.
(2) and then, each channel according to being made of a subcarrier or a plurality of subcarrier carries out Adaptive Modulation to down link.
And have, in the communication system that has adopted based on the scheduling of the receiving quality of communication terminal or adaptive modulation system, in order determine to distribute or modulation parameter, and to need and to be notified to communication counterpart to the index that transmission path state and the receiving quality of the received signal power of the channel that is used to communicate by letter or SINR etc. are represented.
In above-mentioned system, each communication terminal need utilize the control channel of up link etc. to the base station apparatus notice receiving quality information relevant with each channel.Therefore, there are the following problems: the amount of information of the receiving quality information that transmits in up link and communication terminal number and the number of channel expand pro rata.And,, propose a kind of method that is reduced to purpose (patent documentation 1, patent documentation 2, non-patent literature 3, non-patent literature 4) of the amount of information with the receiving quality information that in up link, transmits in order to improve the problems referred to above.
(1) each communication terminal is according to each communication terminal, measure base station apparatus give each communication terminal as communication with and the receiving quality of whole channels of distributing and is only notified the method (first countermeasure) of the mean value of whole channel receiving qualities to base station apparatus.
(2) only select the good channel of receiving quality whole channels that base station apparatus distributes as communication usefulness to each communication terminal of stated number from the good side of receiving quality, and only notify the method (second countermeasure) of the receiving quality of these channels to base station apparatus.
(3) give each communication terminal as selected several reference channel the whole channels using and distribute of communicating by letter from base station apparatus, and represent the value of the receiving quality of each channel, and it is notified to the method (the 3rd countermeasure) of base station apparatus with the difference value of the receiving quality of reference channel.
Patent documentation 1: TOHKEMY 2004-208234 communique
Patent documentation 2: TOHKEMY 2006-50545 communique
Non-patent literature 1: " experimental results of the throughput characteristic of the adaptive modulation-demodulation chnnel coding in the down link VSF-OFCDM broadband wireless access " such as bank mountains, electronic information communication journal technical research report, in May, 2003, R C S2003-25 (his " following り リ Application Network V S F-O F C D M Block ロ one De バ Application De No Line ア Network セ ス To お け ゐ Fitness ying becomes Complex Tone チ ヤ ネ Le symbolism ス Le one プ Star ト spy property real test Knot fruit ", the Electricity feelings Reported skill Intraoperative of Communications Society research Reported announcement of bank mountain, in May, 2003, RCS2003-25)
Non-patent literature 2: preceding former grade " has been utilized the research of the OFDM/TDD load mode of subcarrier Adaptive Modulation ", the comprehensive conference of calendar year 2001 electronic information communication association, March calendar year 2001, B-5-100, p.498 (preceding former he " サ Block キ ヤ リ ア Fitness ying become Tone The send mode to examine with い OFDM/TDD Den ", calendar year 2001 Electricity feelings Reported communication are learned Gross and are closed conference, March calendar year 2001, B-5-100, p.498)
Non-patent literature 3: " CQI report and scheduling procedure ", 3GPP, TSG-RAN WG1Meeting#42bis, R1-051045, in October, 2005
Non-patent literature 4: " Sensitivity of DL/UL Performance to CQI-Compression with Text Proposal ", 3GPP, TSG-RAN WG 1ad hoc meetingon LTE, R1-060228, in January, 2006
But there is following problem in above-mentioned prior art.Promptly, in first countermeasure, can't carry out and the corresponding Adaptive Modulation of the receiving quality of each channel.Therefore, receiving quality than mean value in the better channel transfer rate cross lowly and inefficent, the error rate characteristic can deterioration in the worse channel than mean value at receiving quality.In addition, owing to utilize the frequency selectivity of transmission path can't carry out communication terminal is distributed to the scheduling of the good channel of each receiving quality, the transmission efficiency of entire system descends.
In addition, as second countermeasure, the method of the channel that the receiving quality of a notification number is good in channel, under the situation of the good channel repetition of the receiving quality of the stated number that comes from a plurality of communication terminal notices, the possibility of result of dispatching can produce the unallocated communication terminal that the channel of having notified receiving quality is arranged.At this moment, owing to do not know the receiving quality of other channels of this communication terminal fully, thus can't in vacant channels, dispatch or Adaptive Modulation based on the receiving quality of communication terminal, and transmission efficiency can reduce.
In addition, in the 3rd countermeasure, about the receiving quality difference and distribute to the low channel of possibility of this communication terminal, owing to can utilize the identical amount of information of channel good with receiving quality and that wish to distribute to notify receiving quality information, so carried out the notice of the amount of information more than unnecessary and inefficent.
Summary of the invention
The present invention carries out in view of above-mentioned thing, its purpose is to provide a kind of total notice amount that can suppress receiving quality information, can communicate the Adaptive Modulation in the control device and communicator, multi-carrier communications systems and the communication means of adaptive scheduling again effectively.
(1) in order to reach above-mentioned purpose, the present invention adopts following method.A kind of communicator of the present invention promptly,, be applicable to the multi-carrier communication mode, wherein, in described multi-carrier communication mode, adopt the channel that distributes in a plurality of channels that constitute by at least one subcarrier, by communication counterpart to come received signal, and measure the receiving quality of the signal that receives, and then receiving quality information is notified to described communication counterpart, it is characterized in that described communicator possesses: the receiving quality determination part, it measures the receiving quality of each subcarrier; With receiving quality information generating unit, it determines the request for allocation degree of the described relatively communication counterpart of each channel, select to be used to represent the amount of information of receiving quality information based on described request for allocation degree according to each channel, and generate the described receiving quality information of representing by the described amount of information of selecting based on the described receiving quality that determines.
Thus, owing to determine the request for allocation degree, and select to be used to represent the amount of information of receiving quality information according to each channel based on this request for allocation degree, and generate the receiving quality information of representing by the amount of information of selecting based on the receiving quality that determines, so can suppress the gross information content of receiving quality information, and can communicate Adaptive Modulation and adaptive scheduling in the control device (for example, base station apparatus) effectively.
(2) in addition, in communicator of the present invention, it is characterized in that described receiving quality information generating unit possesses: request degree determination portion, it determines the request for allocation degree of the described relatively communication counterpart of each channel based on the described receiving quality that determines; With the selection generating unit, it selects to be used to represent the amount of information of receiving quality information according to each channel based on described request for allocation degree, and according to each sub carrier group, measurement result based on described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel.
Thus, owing to determine the request for allocation degree, and select to be used to represent the amount of information of receiving quality information according to each channel based on this request for allocation degree, and according to each sub carrier group that constitutes by at least one subcarrier that belongs to each channel, measurement result based on receiving quality, generate the described receiving quality information of representing by the amount of information of selecting, so can suppress the gross information content of receiving quality information, and can communicate Adaptive Modulation and adaptive scheduling in the control device (for example, base station apparatus) effectively.
(3) in addition, in communicator of the present invention, it is characterized in that, described receiving quality information generating unit possesses the average portion of receiving quality, and one of them in mean value, intermediate value, mode or the minimum value of receiving quality measurement result of the whole subcarriers that belong to each channel calculated by the average portion of described receiving quality; The value of described mean value, intermediate value, mode or minimum value is high more, and described request degree determination portion improves the request for allocation degree of described each channel more.
Thus because the high more request for allocation degree that improves each channel more of value of mean value, intermediate value, mode or minimum value, so the request for allocation degree high more can in communication control unit, effectively dispatch more and Adaptive Modulation under high-speed communication.
(4) in addition, in communicator of the present invention, it is characterized in that, the high channel of described request for allocation degree, described selection generating unit generates the big more receiving quality information of amount of information.
Thus, because the high channel of request for allocation degree, just generate the big more receiving quality information of amount of information, so in communication control unit, can carry out channel that the request for allocation degree is high just based on effective scheduling of detailed more receiving quality information and the high-speed communication under the Adaptive Modulation.On the other hand, by the low channel of request for allocation degree, just generate the more little receiving quality information of amount of information, thereby can suppress gross information content.At this moment, in communication control unit, even under the situation owing to the low channel of the request for allocation degree in the allocate communications terminal installation of having to, also can carry out scheduling and Adaptive Modulation, so can avoid all not notifying the reduction of the transmission efficiency under the quality information situation of the not good channel of receiving quality based on the rough receiving quality information in the communication terminal.
(5) in addition, in communicator of the present invention, it is characterized in that, described selection generating unit just improves the mode of the bit number of each sub carrier group more according to channel that described request for allocation degree is high, generates according to described bit number and the measurement result of described receiving quality is carried out receiving quality information after the quantization.
Thus, because the high channel of request for allocation degree, just improve the bit number of each sub carrier group more, and generate according to bit number the measurement result of receiving quality is carried out receiving quality information after the quantization, so in communication control unit, can carry out channel that the request for allocation degree is high just based on effective scheduling of detailed more receiving quality information and the high-speed communication under the Adaptive Modulation.On the other hand,, just reduce the bit number of each sub carrier group more, and generate according to bit number the measurement result of receiving quality is carried out receiving quality information after the quantization, thereby can suppress total bit number by the low channel of request for allocation degree.At this moment, in communication control unit, even under the situation owing to the low channel of the request for allocation degree in the allocate communications terminal installation of having to, also can carry out scheduling and Adaptive Modulation, so can avoid all not notifying the reduction of the transmission efficiency under the quality information situation of the not good channel of receiving quality based on the rough receiving quality information in the communication terminal.
(6) in addition, in communicator of the present invention, it is characterized in that, as described receiving quality information, described selection generating unit generates non-differential received quality information at predetermined at least one sub carrier group, generate the differential received quality information at other sub carrier group, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of described receiving quality information; Described differential received quality information is represented the measurement result of described receiving quality and the information of the difference value between the adjacent sub-carrier group for the high more mode of many more bit numbers of just utilizing of request for allocation degree according to affiliated channel.
Thus, because as receiving quality information, generate non-differential received quality information about at least one sub carrier group of predesignating, and generate the differential received quality information about other sub carrier group, so can suppress the gross information content of receiving quality information, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of receiving quality; Described differential received quality information is represented the measurement result of receiving quality and the information of the difference value between the adjacent sub-carrier group for the high more mode of many more bit numbers of just utilizing of request for allocation degree according to affiliated channel.In addition, in communication control unit, can carry out channel that the request for allocation degree is high just based on effective scheduling of detailed more receiving quality information and the high-speed communication under the Adaptive Modulation.On the other hand, because generating according to the channel that the request for allocation degree is low just utilizes the mode of few more bit number to represent the differential received quality information of difference value, so in communication control unit, even under the situation owing to the low channel of the request for allocation degree in the allocate communications terminal installation of having to, also can carry out scheduling and Adaptive Modulation, thereby can avoid all not notifying the reduction of the transmission efficiency under the receiving quality information state of the not good channel of receiving quality based on the rough receiving quality information in the communication terminal.
(7) in addition, in communicator of the present invention, it is characterized in that, as described receiving quality information, described selection generating unit generates non-differential received quality information and differential received quality information at described each sub carrier group, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of described receiving quality; Described differential received quality information is the measurement result of the described receiving quality of expression and the information of the difference value between the adjacent sub-carrier group; And, described communicator, the high channel of described request for allocation degree is just got over the sub carrier group that more options generate described non-differential received quality information.
Thus, because as receiving quality information, generate non-differential received quality information and differential received quality information about each sub carrier group, and the high more channel of described request for allocation degree just more more options generate the sub carrier group of non-differential received quality information, so can suppress the gross information content of receiving quality information, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of receiving quality; Described differential received quality information is the measurement result of expression receiving quality and the information of the difference value between the adjacent sub-carrier group.In addition, in communication control unit, can carry out channel that the request for allocation degree is high just based on effective scheduling of detailed more receiving quality information and the high-speed communication under the Adaptive Modulation.On the other hand, just reduce the sub carrier group that generates non-differential received quality information more by the channel that the request for allocation degree is low, thereby in communication control unit, even under the situation of the channel that the request for allocation degree in the allocate communications terminal installation of having to is low, also can carry out scheduling and Adaptive Modulation, so can avoid all not notifying the reduction of the transmission efficiency under the receiving quality information state of the not good channel of receiving quality based on the rough receiving quality information in the communication terminal.
(8) in addition, in communicator of the present invention, it is characterized in that described selection generating unit makes the bit number of the described differential received quality information of expression also lack than the bit number of representing described non-differential received quality information.
Thus, because the bit number of expression differential received quality information is also lacked than the bit number of representing described non-differential received quality information, so can reduce gross information content.
(9) in addition, a kind of multi-carrier communications systems of the present invention is made of communication control unit and communication terminal, wherein, described communication control unit from a plurality of channels that constitute by at least one subcarrier to described communication terminal allocated channel; Described communication terminal adopts the channel that is distributed by described communication control unit to come received signal, and measures the receiving quality of the signal that receives, and then receiving quality information is notified to described communication control unit; Described multi-carrier communications systems is characterised in that, described communication terminal is measured the receiving quality of each subcarrier, determine the request for allocation degree of the described relatively communication control unit of each channel, select to be used to represent the amount of information of receiving quality information according to each channel based on described request for allocation degree, and according to each sub carrier group, measurement result based on described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, notify the receiving quality information of described generation to described communication control unit, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel.
Thus, owing to determine the request for allocation degree, select to be used to represent the amount of information of receiving quality information according to each channel based on this request for allocation degree, and according to each sub carrier group that constitutes by at least one subcarrier that belongs to each channel, measurement result based on receiving quality, generate the described receiving quality information of representing by the amount of information of selecting, thus the gross information content of receiving quality information can be suppressed, and can communicate Adaptive Modulation and adaptive scheduling in the control device effectively.
(10) in addition, a kind of communication means of the present invention, be the communication means of the multi-carrier communications systems that constitutes by communication control unit and communication terminal, wherein, described communication control unit from a plurality of channels that constitute by at least one subcarrier to described communication terminal allocated channel; Described communication terminal adopts the channel that is distributed by described communication control unit to come received signal, and measures the receiving quality of the signal that receives, and then to described communication control unit notice receiving quality information; Described communication means is characterised in that, in described communication terminal, measure the receiving quality of each subcarrier, determine the request for allocation degree of the described relatively communication control unit of each channel, select to be used to represent the amount of information of receiving quality information according to each channel based on described request for allocation degree, according to each sub carrier group, measurement result based on described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, notify the receiving quality information of described generation to described communication control unit, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel.
Thus, owing to determine the request for allocation degree, select to be used to represent the amount of information of receiving quality information according to each channel based on this request for allocation degree, and according to each sub carrier group that constitutes by at least one subcarrier that belongs to each channel, measurement result based on receiving quality, generate the described receiving quality information of representing by the amount of information of selecting, thus the gross information content of receiving quality information can be suppressed, and can communicate Adaptive Modulation and adaptive scheduling in the control device effectively.
The invention effect
According to the present invention, because in communication terminal, determine the request for allocation degree, select to be used to represent the amount of information of receiving quality information according to each channel based on this request for allocation degree, and generate the receiving quality information of representing by the amount of information of selecting, so can suppress the gross information content of receiving quality information, and can communicate Adaptive Modulation and adaptive scheduling in the control device (for example, base station apparatus) effectively.
Description of drawings
Fig. 1 is the figure of an example of subframe (sub frame) structure of the down link of expression in first execution mode.
Fig. 2 is the block diagram of the schematic configuration of the base station apparatus in expression first execution mode.
Fig. 3 is the block diagram of the schematic configuration of the communication terminal in expression first execution mode.
Fig. 4 is the block diagram of the schematic configuration of the receiving quality information generating unit in the expression communication terminal.
Fig. 5 is the flow chart of an example of the action that generates of the receiving quality information in the expression receiving quality information generating unit (and receiving quality determination part).
Fig. 6 A is the figure of the example of L1 receiving quality information, L2 receiving quality information and L3 receiving quality information in expression first execution mode.
Fig. 6 B is the figure of the example of L1 receiving quality information, L2 receiving quality information and L3 receiving quality information in expression first execution mode.
Fig. 7 A is the figure of the example of L1 receiving quality information, L2 receiving quality information and L3 receiving quality information in expression first execution mode.
Fig. 7 B is the figure of the example of L1 receiving quality information, L2 receiving quality information and L3 receiving quality information in expression first execution mode.
Fig. 8 is the generation result's of the receiving quality information of expression in first execution mode the figure of an example.
Fig. 9 A is the receiving quality information under expression D1=8 (b1 '=3), D2=4 (b2 '=2), D3=2 (b3 '=1) situation and the figure of the corresponding example between the difference value.
Fig. 9 B is the receiving quality information under expression D1=8 (b1 '=3), D2=4 (b2 '=2), D3=2 (b3 '=1) situation and the figure of the corresponding example between the difference value.
Fig. 9 C is the receiving quality information under expression D1=8 (b1 '=3), D2=4 (b2 '=2), D3=2 (b3 '=1) situation and the figure of the corresponding example between the difference value.
Figure 10 is the block diagram of the schematic configuration of the base station apparatus in expression second execution mode.
Figure 11 is the block diagram of the schematic configuration of the communication terminal in expression second execution mode.
Figure 12 is the block diagram of the schematic configuration of the receiving quality information generating unit in the expression communication terminal.
Figure 13 A is the flow chart of an example of the action that generates of the receiving quality information in the expression receiving quality information generating unit (and receiving quality determination part).
Figure 13 B is the flow chart of an example of the action that generates of the receiving quality information in the expression receiving quality information generating unit (and receiving quality determination part).
Figure 14 is the generation result's of the receiving quality information of expression in second execution mode the figure of an example.
Figure 15 is the block diagram of the schematic configuration of the base station apparatus in expression the 3rd execution mode.
Figure 16 is the block diagram of the schematic configuration of the communication terminal in expression the 3rd execution mode.
Figure 17 is the block diagram of the schematic configuration of the receiving quality information generating unit in the expression communication terminal.
Figure 18 A is the flow chart of an example of the action that generates of the receiving quality information in the expression receiving quality information generating unit (and receiving quality determination part).
Figure 18 B is the flow chart of an example of the action that generates of the receiving quality information in the expression receiving quality information generating unit (and receiving quality determination part).
Figure 19 is the generation result's of the receiving quality information of expression in the 3rd execution mode the figure of an example.
Figure 20 is the figure of an example of the subframe structure of the down link of expression in the 4th execution mode.
Symbol description:
200,900, the 1500-base station apparatus, 201-sends buffer memory portion, the 202-encoding section, 203-mapping portion, 204-frequency time change portion, the 205-GI insertion section, the 206-D/A transformation component, 207-wireless transmission part, 208-antenna part, 209-wireless receiving portion, 210-A/D transformation component, 211-are separated mapping portion, the 212-lsb decoder, 213-receiving quality information storage part, 214-scheduling portion, 215-down link control information generating unit, 216-pilot tone generating unit, 300,1000, the 1600-wireless terminal device, the 301-antenna part, 302-wireless receiving portion, 303-A/D transformation component, 304-GI removal portion, 305-temporal frequency transformation component, 306-separates mapping portion, the 307-lsb decoder, 308-receiving quality determination part, 309-receiving quality information generating unit, 310-encoding section, 311-mapping portion, the 312-D/A transformation component, the 313-wireless transmission part, 314-demodulation control part, 341, the average portion of 1041-receiving quality, 342,1042-request degree determination portion, 343,1044,1644-selects generating unit, 913,1513-receiving quality information storage part, 1009,1609-receiving quality information generating unit, 1043,1643-subtraction portion, 1045,1645-accumulation portion
Embodiment
Secondly, with reference to accompanying drawing the execution mode that the present invention is correlated with is described.Below, describe in following cellular system, being suitable for embodiments of the present invention, wherein, described cellular system adopts and utilized the polynary connected mode of OFDM (Orthogonal Frequency Division Multiplex: hereinafter referred to as " OFDM ") is the polynary access of orthogonal frequency (Orthogonal FrequencyDivision Multiple Access: hereinafter referred to as " OFDMA ") system, in each channel that constitutes by at least one subcarrier, carry out adaptive scheduling (distribution of channel), and carry out Adaptive Modulation according to each subcarrier.
And have, in the explanation of each following execution mode, utilize the index that calculates based on frequency pilot sign (pilot symbol) as receiving quality information, for example SINR (Signal to Interferenceplus Noise power Ratio: received signal power is to interfering and noise power ratio) describes.
(first execution mode)
Fig. 1 is the figure of an example of the subframe structure of the down link of expression in the present embodiment.As shown in Figure 1, the channel in the so-called present embodiment means one or more subcarriers.In addition, subframe means transmission unit, and with it as the scope of in once scheduling is handled, carrying out channel allocation.In addition, subframe is divided into T (T is a natural number) with the long TTI of official hour (Transmission TimeInterval) on time-axis direction, with in the 1TTI in 1 channel as thread (below, be called " Resource Block (RB) ").At this, be described as follows situation: promptly, each communication terminal is according to the receiving quality of each subcarrier to base station apparatus report down link; To be unit with the Resource Block dispatch the down link data of giving each communication terminal base station apparatus, and according to each subcarrier in this Resource Block, further carrying out Adaptive Modulation.
And have, the scope of application of the present invention is not limited to the subframe structure of Fig. 1, and in the system that utilizes a plurality of channels to communicate, the present invention is applicable to that also the receiving quality of each channel in each communication terminal might different systems.
Fig. 2 is the block diagram of the schematic configuration of the base station apparatus 200 in the expression present embodiment.Fig. 3 is the block diagram of the schematic configuration of the communication terminal 300 in the expression present embodiment.In Fig. 2, base station apparatus 200 has: send buffer memory portion 201, encoding section 202, mapping portion 203, frequency time change portion 204, GI (Guard Interval: protection at interval) insertion section 205, D/A (Digital-to-Analog) transformation component 206, wireless transmission part 207, antenna part 208, wireless receiving portion 209, A/D (Analog-to-Digital) transformation component 210, separate mapping portion 211, lsb decoder 212, scheduling portion 214, down link control information generating unit 215, pilot tone generating unit 216, receiving quality information storage part 213.
In Fig. 3, communication terminal 300 has: antenna part 301, wireless receiving portion 302, A/D transformation component 303, GI removal portion 304, temporal frequency transformation component 305, separate mapping portion 306, lsb decoder 307, receiving quality determination part 308, receiving quality information generating unit 309, encoding section 310, mapping portion 311, D/A transformation component 312, wireless transmission part 313, demodulation control part 314.
At first, utilize Fig. 2 and Fig. 3 that the step that base station apparatus 200 sends down link signal and communication terminal 300 these down link signals of reception is described.In Fig. 2, transmission buffer memory portion 201 will import the transmission data of coming and accumulate in the buffer according to the communication terminal that each sends the destination, and export the transmission data of accumulating according to from the request of encoding section 202 to encoding section 202.
Scheduling portion 214 reads the receiving quality information by each communication terminal notice that is stored in the receiving quality information storage part 213.And, give each resource block assignments (scheduling) communication terminal of each channel based on this information, and be chosen in the modulation parameter of using in the interior subcarrier of separately Resource Block.And, export this scheduling result (schedule information) and this modulation parameter selection result (modulation parameter information).And have, scheduling can also be based on carrying out from the transmission data amount information that sends buffer memory portion 201.
Down link control information generating unit 215 generates and exports the down link control information that comprises from the schedule information and the modulation parameter information of scheduling portion 214.Encoding section 202 is according to giving from the assignment information (schedule information) of each communication terminal of the next down link of scheduling portion 214 notices, from send buffer memory portion 201, read the transmission data of the necessary amounts of issuing each communication terminal, and then according to the modulation parameter information and the schedule information of coming by scheduling portion 214 notices, the transmission data of issuing each communication terminal are carried out error correction coding handle, generate and the dateout sequence.
Pilot tone generating unit 216 is measured and is generated and export to sending the pilot frequency sequence that signal inserts for the receiving quality that communicates in the terminal installation.Mapping portion 203 is based on the modulation parameter information and the schedule information of being come by scheduling portion 214 notices, each bit of modulation symbol mapping (enum) data sequence on subcarrier, the pilot frequency sequence that the modulation symbol of the regulation on the subcarrier of regulation shines upon and exports down link control information and generate in pilot tone generating unit 216.For example, in the example of Fig. 1, respectively based on the data symbol mapping (enum) data sequence of schedule information in figure, the frequency pilot sign of the regulation in figure mapping pilot frequency sequence, the down link control information sign map down link control information of the regulation in figure.
204 pairs of modulation symbol sequences from 203 outputs of mapping portion of frequency time change portion carry out the frequency time change to be handled, for example carry out fast adverse Fourier transform (Inverse Fast Fourier Transform:IFFT), be transformed to the ofdm signal of time shaft, the signal behind 205 output transforms of GI insertion section.GI insertion section 205 appends to guard period GI in the ofdm signal that generates in frequency time change portion 204.The signal transformation that D/A transformation component 206 will add guard period GI is analog signal.207 pairs of these analog signals in wireless transmission part are carried out up-conversion (upconvert), and are sent in the communication terminal 300 by antenna part 208.
Secondly, utilize Fig. 3 that the action in the communication terminal 300 is described.In communication terminal 300, wireless receiving portion 302 receives the signal that sends from base station apparatus 200 via antenna part 301.A/D transformation component 303 receives wireless receiving portion 302 and the analog signal of carrying out after the down-conversion (downconvert) is transformed to digital signal.Guard period GI removes in GI removal portion 304 from this digital signal, and the signal that will remove behind the guard period GI outputs in the temporal frequency transformation component 305.Temporal frequency transformation component 305 is by carrying out the temporal frequency conversion to the ofdm signal from GI removal portion 304 output, fast fourier transform (Fast Fourier Transform:FFT) for example, thus be transformed to modulation symbol sequence.
Separating mapping portion 306 at first separates frequency pilot sign and it is outputed in the receiving quality determination part 308 from the modulation symbol sequence by temporal frequency transformation component 305 output.Secondly, down link control information is separated mapping and output in the demodulation control part 314.And then, according to schedule information and modulation parameter information from demodulation control part 314, to the data sequence separate the mapping and output in the lsb decoder 307.And have, also can carry out the transmission path compensation to modulation symbol sequence based on frequency pilot sign.
Lsb decoder 307 handle carrying out error correction decoding from the data sequence of separating 306 outputs of mapping portion, and output receives data according to schedule information and modulation parameter information from 314 outputs of demodulation control part.Demodulation control part 314 is from extracting schedule information (with the relevant information of Resource Block of distributing to the transmission data of issuing communication terminal 300) and modulation parameter information (with the relevant information of modulation parameter of each subcarrier in the Resource Block that is distributed) by separating the down link control information that mapping portion 306 input comes, and to separating mapping portion 306 and lsb decoder 307 is exported.And have, also can be in base station apparatus 200 in advance down link control information is carried out carrying out error correction decoding under the situation of error correction coding.
Secondly, utilize Fig. 2 and Fig. 3 that communication terminal 300 is described the step that report information feeds back to base station apparatus 200.At first, utilize Fig. 3 that the action in the communication terminal 300 is described.Receiving quality determination part 308 utilizes from separating the frequency pilot sign of mapping portion 306 outputs, the receiving quality in each subcarrier is measured, and this receiving quality measurement result is outputed in the receiving quality information generating unit 309.And have, in the present embodiment, though the situation of utilizing frequency pilot sign to measure receiving quality is illustrated, but utilizing data symbol to carry out receiving quality mensuration or utilizing the error correction decoding result of determination that receives data to carry out under the situation of receiving quality mensuration, the present invention is suitable for certainly too.
Receiving quality information generating unit 309 is determined the request precedence of each channel based on the receiving quality measurement result from each subcarrier of receiving quality determination part 308 output, utilizes the receiving quality information that generates and export the receiving quality measurement result of each subcarrier of representing that each channel is interior with the corresponding different number of degrees (quantization bit number) of this request precedence of determining.And have, seeing below in detail of receiving quality information generating unit 309 stated.
310 pairs of encoding section carry out error correction coding for the transmission data of base station apparatus, and the dateout sequence.Mapping portion 311 is mapped to modulation symbol and output with the receiving quality information of receiving quality information generating unit 309 generations and the data sequence of encoding section 310 outputs.And have, receiving quality information also can differently be notified to base station apparatus with the transmission data of giving base station apparatus.
D/A transformation component 312 will be an analog signal from the signal transformation of mapping portion 311 outputs.Analog signal after 313 pairs of these conversion in wireless transmission part is carried out up-conversion, and sends to base station apparatus 200 by antenna part 301.
Secondly, utilize Fig. 2 that the action in the base station apparatus 200 is described.In base station apparatus 200, wireless receiving portion 209 receives the signal that sends from communication terminal 300 via antenna part 208.After 209 pairs of these analog signals that receive of wireless receiving portion were carried out down-conversion, A/D transformation component 210 was transformed to digital signal with it and exports to separating mapping portion 211.Separate 211 pairs of digital signals of sending of mapping portion (modulation symbol) and separate mapping from A/D transformation component 210, and separation receiving quality information and data sequence, respectively to receiving quality information storage part 213 output receiving quality information, to lsb decoder 212 dateout sequences.
212 pairs of data sequences that read out in separating mapping portion 211 of lsb decoder are carried out error correction decoding, and read the reception data.Receiving quality information storage part 213 is separated the receiving quality information from each communication terminal notice that mapping portion 211 separates according to each communication terminal storage, and to 214 outputs of scheduling portion.
Fig. 4 is the block diagram of the schematic configuration of the receiving quality information generating unit 309 in the expression communication terminal 300.Import from the receiving quality measurement result of each subcarrier of receiving quality determination part 308 outputs to average portion 341 of receiving quality and selection generating unit 343.The average portion 341 of receiving quality is according to the mean value (the receiving quality mean value of each channel) of each channel calculation receiving quality measurement result that also output is relevant with the whole subcarriers that belong to each channel.Request degree determination portion 342 is set up precedence to each channel, and is exported the precedence of each channel according to the good order of the receiving quality mean value of each channel of exporting from the average portion 341 of receiving quality, the order of promptly distributing to the base station apparatus request.
Selecting generating unit 343 to select based on what number of degrees based on the precedence of each channel of determining in request degree determination portion 342 is that the information of several bits comes the receiving quality measurement result of each subcarrier of coming from 308 inputs of receiving quality determination part is carried out quantization, generates and export the receiving quality information of each subcarrier of being represented by the bit number of selecting.And then, will the information that the kind of the receiving quality information selected in each channel is discerned be appended in the described receiving quality information.And have, also can add the information relevant with the request for allocation degree of each channel.
Fig. 5 is the flow chart of an example of the action that generates of the receiving quality information in expression receiving quality information generating unit 309 (and receiving quality determination parts 308).In Fig. 5, establishing whole numbers of channel is Nch.And, at M1 the channel that begins from the good side of receiving quality in whole channels, with L1 grade (b1 bit) the receiving quality measurement result of each subcarrier is carried out quantization, and generation receiving quality information (below, be called " L1 receiving quality information ").In addition,, the receiving quality measurement result of each subcarrier is carried out quantization with L2 grade (b2 bit) at M2 the channel of next, and generation receiving quality information (below, be called " L2 receiving quality information ").And then, at remaining channel, the receiving quality measurement result of each subcarrier is carried out quantization with L3 grade (b3 bit), and generation receiving quality information (below, be called " L3 receiving quality information ").
And have, at this, L1, L2, L3, b1, b2 and b3 are for satisfying the natural number of L1＞L2＞L3, b1＞b2＞b3, and M1 and M2 are for satisfying the positive integer of (M1+M2)≤Nch.
Below, utilize Fig. 5 to generate being described in detail of action to receiving quality information.At first, utilize from the frequency pilot sign of separating 306 outputs of mapping portion and measure and export receiving quality (step S501) each subcarrier.Secondly, belong to the mean value (the receiving quality mean value of each channel) (step S502) of the relevant receiving quality measurement result of whole subcarriers of each channel according to each channel calculation, each channel is set up precedence (step S503) according to the order that the receiving quality mean value of each channel that calculates is good.Secondly, each channel is carried out following processing (circulation 1 of step S504～S509) repeatedly.
Described precedence with the j channel, generate the number M 1 of the channel of L1 receiving quality information, the number M 2 that generates the channel of L2 receiving quality information compares (step S505), and the precedence of j channel the M1 position with interior situation under, the receiving quality measurement result quantum of each subcarrier in the j channel is turned to L1 receiving quality information and output (step S506), precedence at the j channel is under the situation of (M1+1) position～(M1+M2) position, the receiving quality measurement result quantum of each subcarrier in the j channel is turned to L2 receiving quality information and output (step S507),, under the following situation in (M1+M2+1) position, the receiving quality measurement result quantum of each subcarrier in the j channel is turned to L3 receiving quality information and exports (step S508) in the precedence of j channel.
In above-mentioned example, in selecting generating unit 343, as substituting of the information that the kind of the receiving quality information selected in each additional channel is discerned, number group, that belong to the channel of each group of the channel of the L2 receiving quality information that the group of the channel that request for allocation degree that also can additional notifications L1 receiving quality information is the highest and notice request for allocation degree are time high.
Fig. 6 A, Fig. 6 B, Fig. 7 A and Fig. 7 B are the figure of the example of L1 receiving quality information, L2 receiving quality information and L3 receiving quality information in the expression present embodiment.Fig. 6 A and Fig. 6 B illustrate following example: represented L1 receiving quality information, represented L2 receiving quality information, represented the receiving quality information (at this, using SINR as receiving quality) under the situation of L3 receiving quality information and the example of the corresponding relation between each grade by the information of each subcarrier 2 grade (L3=2, b3=1 bit) by the information of each subcarrier 4 grade (L2=4, b2=2 bit) by the information of each subcarrier 8 grade (L1=8, b1=3 bit).
For example, as shown in Figure 6A, also can be L1 receiving quality information setting for 1 grade of L2 receiving quality information is segmented with the L1/L2 grade, L2 receiving quality information setting is for to segment 1 grade of L3 receiving quality information with the L2/L3 grade.In addition, shown in Fig. 6 B, also can be that the receiving quality represented by the lowest class is identical in 3 kinds of receiving quality information, in other grades, L1 receiving quality information setting is for to segment each grade of L2 receiving quality information, and L2 receiving quality information setting is for to segment L3 receiving quality information.Wherein, the present invention is not limited to these examples.
In addition, preferred L1 receiving quality information, L2 receiving quality information and each grade of L3 receiving quality information and the relation between the receiving quality (SINR), for example determine based on the corresponding relation between modulation parameter under the Adaptive Modulation in the base station apparatus and the receiving quality (SINR) (the SINR threshold value when selecting each modulation parameter etc.), perhaps further consider to dispatch and determine, perhaps certain scope of receiving quality (SINR) is carried out L1 five equilibrium, L2 five equilibrium or L3 five equilibrium and determine.But be not limited thereto.
Fig. 7 A and Fig. 7 B are illustrated in that to notify the combination of modulation system (being totally 3 kinds of QPSK, 16QAM, 64QAM the example of Fig. 7 A and Fig. 7 B) and channel encoding rate R (being 1/3,1/2,3/4 in the example of Fig. 7 A and Fig. 7 B) be MCS as the figure of an example of the corresponding relation between each grade under the situation of receiving quality information, receiving quality (SINR) and L1 receiving quality information, L2 receiving quality information and L3 receiving quality information to base station apparatus from communication terminal.And have, in the example of Fig. 7 A and Fig. 7 B, comprise " do not have and send " that sends (being called carrier wave hole (carrier hole)) as the lowest class of MCS.
In Fig. 7 A and Fig. 7 B, the MCS that each subcarrier 8 grade of expression (L1=8, b1=3 bit) are shown as L1 receiving quality information, represent each subcarrier 4 grade (L1=4, b2=2 bit) MCS as L2 receiving quality information, represent that each subcarrier 2 grade (L3=2, b3=1 bit) are as the example under the situation of L3 receiving quality information.
Shown in Fig. 6 A, Fig. 6 B, Fig. 7 A and Fig. 7 B, though L1 receiving quality information can be notified than the more detailed receiving quality of each subcarrier, but it is big to the amount of information (bit number) of base station apparatus notice from communication terminal, though the receiving quality of each subcarrier of L2 receiving quality information notice is more rough than L1 receiving quality information, but amount of information is little, though the receiving quality of each subcarrier of L3 receiving quality information notice is thicker than L2 receiving quality information, amount of information but can be minimum.
Fig. 8 is the generation result's of the receiving quality information of expression in the present embodiment the figure of an example.Fig. 8 is the example under the following situation: utilize L1 receiving quality information, L2 receiving quality information and the L3 receiving quality information shown in the example of Fig. 7 B as receiving quality information, all the number of channel is that sub-carrier number included in 8 (Nch=8), each channel is 4, will reports that the number of channel of L1 receiving quality information is made as 2 (M1=2), will reports that the number of channel of L2 receiving quality information is made as 2 (M2=2), therefore will report that the number of channel of L3 receiving quality information is made as 4 (Nch-M1-M2=4).
Dotted line in Fig. 8 chart is illustrated in the receiving quality measurement result that determines in the receiving quality determination part 308, is SINR (longitudinal axis in left side), chain-dotted line is represented the mean value of the receiving quality measurement result relevant with whole subcarriers in each channel, and solid line is represented the receiving quality information (longitudinal axis on right side) of each subcarrier of being generated.
According to the order foundation of in Fig. 8, carrying out each channel by the good order of the receiving quality mean value in each channel shown in this chain-dotted line, in the M1 position with interior, promptly generate L1 receiving quality information about primary channel 4 and deputy channel 5, (M1+1) position～(M1+M2) position, promptly the channel 1 about tertiary channel 2 and the 4th generates L2 receiving quality information, generates L3 receiving quality information for following each channel (channel 3, channel 6, channel 7 and channel 8) of other (M1+M2+1).
In the example of Fig. 8, with respect to utilizing L1 receiving quality information to generate required bit number 96 bits (the receiving quality information bit 3 of sub-carrier number 4 in the number of channel 8 * channel * each subcarrier) under the situation of receiving quality information of whole subcarriers, be 56 bits in the present embodiment.In addition, with respect to only relevant with the channel of the good stated number of receiving quality and generate the situation of receiving quality information, comprise the relevant receiving quality information of whole subcarriers in the present embodiment with whole channels.
Thus, according to present embodiment,, selecting to the relative importance value (request degree) of the channel of the distribution of base station apparatus 200 request down links during from communication terminal 300: adopt by each subcarrier L1 grade (b1 bit) to come the L1 receiving quality information that the receiving quality measurement result relevant with subcarrier in each channel shows is notified or adopted by each subcarrier L2 grade (b2 bit according to communication terminal 300 to base station apparatus 200 notice receiving quality information; B2＜b1) comes the L2 receiving quality information that the receiving quality measurement result relevant with subcarrier in each channel shows is notified or adopted by each subcarrier L3 grade (b3 bit; B3＜b2) comes the L3 receiving quality information that the receiving quality measurement result relevant with subcarrier in each channel shows is notified.
Therefore, about included from M1 the channel that the best side of receiving quality for communication terminal 300 begins in the down link, be M1 the high channel of relative importance value that communication terminal 300 distributes to base station apparatus 200 requests, the L1 receiving quality information of utilizing a lot of number of degrees that the receiving quality of each subcarrier in this channel is represented in detail by notice, thereby under the situation that 200 pairs of these communication terminals 300 of base station apparatus distribute from a described M1 channel, can carry out effective channel (Resource Block wherein) and distribute and Adaptive Modulation, and can realize the more transmission of high speed.
And then, when the scheduling result of base station apparatus 200 is in the time distributing best described M1 the channel of for communication terminal 300 receiving quality can't in the down link communication terminal 300, about next M2 good channel of receiving quality of a described M1 channel, be secondly M2 the high channel of relative importance value of request distribution of a described M1 channel, by prenoticing the number of degrees that utilization lacks than L1 receiving quality information and adopting moderate level of detail to represent the L2 receiving quality information of the receiving quality of each subcarrier in this channel, thereby under the situation of from a described M2 channel, distributing at 200 pairs of these communication terminals of base station apparatus, 300 a replacement described M1 channel, though the efficient of channel allocation and Adaptive Modulation reduces also lowlyer than L1 receiving quality information, but can cut down the amount of information of receiving quality information.
On the other hand, when the scheduling result of base station apparatus 200 is can't be when communication terminal 300 distributes receiving quality is good for communication terminal 300 described M1 channels and described M2 channel in the down link, about other channels, organize the L3 receiving quality information of the receiving quality of slightly representing each subcarrier in each channel by prenoticing number of degrees that utilization also lacks than L2 receiving quality information, even thereby under the situation that 200 pairs of these communication terminals 300 of base station apparatus distribute from the channel except a described M1 channel and a described M2 channel, can at utmost cut down the amount of information of receiving quality information, can guarantee to transmit by rough Adaptive Modulation again.
More than, can suppress from the receiving quality notification of information amount of information in the up link of communication terminal, in the data communication of down link, under the situation of the channel that the request for allocation degree in being assigned communication terminal is high, can carry out based on the efficient scheduling of the detailed receiving quality information in the communication terminal and the high-speed communication under the Adaptive Modulation.In addition, even under the situation of the low channel of the request for allocation degree in the allocate communications terminal installation of having to, also can be suitable for scheduling and Adaptive Modulation based on the rough receiving quality information in the communication terminal.
(second execution mode)
Below, second execution mode of the present invention is described.In the first embodiment, following situation is illustrated: promptly, according to the channel assignment request degree in the communication terminal 300, from the L1 receiving quality information of representing each receiving quality by L1 the grade that adopts each subcarrier b1 bit performance, (L2 the grade of performance of b2＜b1) represents the L2 receiving quality information of each receiving quality and (L3 the grade of b3＜b2) show represented to select the receiving quality information as the subcarrier in each channel the L3 receiving quality information of each receiving quality by employing b3 bit by adopting the b2 bit.
Communication terminal 1000 in the present embodiment about the initial subcarrier of initial channel, is selected the information (below, be called " non-differential received quality information " or " non-difference information ") of expression receiving quality measurement result, with as receiving quality information; About other subcarriers, request for allocation degree according to the channel under this subcarrier, from following receiving quality information, select, with as receiving quality information: promptly, the receiving quality information of the information and the difference value between the adjacent sub-carrier of expression receiving quality measurement result being represented by the difference grade of D1 grade (b1 ' bit: b1 ' be natural number) (below, be called " D1 differential received quality information "), by the D2 grade (b2 ' bit: the receiving quality information that the difference grade natural number that satisfies b2 '＜b1 ') is represented the information and the difference value between the adjacent sub-carrier of expression receiving quality measurement result (below, be called " D2 differential received quality information "), and by the D3 grade (b3 ' bit: the receiving quality information that the difference grade natural number that satisfies b3 '＜b2 ') is represented the information and the difference value between the adjacent sub-carrier of expression receiving quality measurement result (below, be called " D3 differential received quality information ").
Fig. 9 A, Fig. 9 B and Fig. 9 C illustrate receiving quality information under D1=8 (b1 '=3), D2=4 (b2 '=2), D3=2 (b3 '=1) situation and the corresponding example between the described difference value.In following situation shown in the example of Fig. 9 A: promptly, 8 values of 0～7 that definition shows with 3 bits are as D1 differential received quality information, respectively corresponding ± 0 ,+1 ,+2 ,+each difference value of 3 ,-4 ,-3 ,-2 ,-1,4 values of 0～3 that definition shows with 2 bits are as D2 differential received quality information, respectively corresponding ± 0 ,+each difference value of 1 ,-2 ,-1, definition with 2 values of 0 and 1 of 1 bit performance as D3 differential received quality information, each difference value of correspondence+1 ,-1 respectively.Fig. 9 B, Fig. 9 C illustrate other examples of corresponding each difference value of value that makes each receiving quality information similarly.
Thus, as difference value with D1 grade (b1 ' bit), D2 grade (b2 ' bit) and D3 grade (b3 ' bit) performance, the preferred value of utilizing by 2 complement performance of each bit number, the roughly the same value of the scope of the difference value of perhaps setting and being showed is used, but is not limited thereto.
Figure 10 and Figure 11 represent the block diagram of the schematic configuration of base station apparatus 900 in the present embodiment and communication terminal 1000 respectively.In the functional block of base station apparatus 900 in the present embodiment, the receiving quality information-storing device 913 suitable with the receiving quality information storage part 23 of base station apparatus 200 is different with first execution mode.In addition, the receiving quality information generating unit 1009 that the receiving quality information generating unit 309 of the communication terminal in the present embodiment 1000 and communication terminal 300 is suitable is different with first execution mode.Other structures of base station apparatus and communication terminal are identical with first execution mode (Fig. 2, Fig. 3), omit its explanation.
In base station apparatus shown in Figure 10 900, receiving quality information storage part 913 is to separate the receiving quality information by each communication terminal notice that mapping portion 211 separates, with the non-differential received quality information relevant with the initial subcarrier of initial channel is starting point, the pairing difference value of differential received quality information that addition is relevant with each subcarrier successively, restore the information of the relevant receiving quality of each subcarrier of expression, store according to each communication terminal, and to 214 outputs of scheduling portion.
In communication terminal shown in Figure 11 1000, receiving quality information generating unit 1009 is based on the receiving quality measurement result from each subcarrier of receiving quality determination part 308 outputs, determine the request precedence of each channel, receiving quality measurement result with the initial subcarrier of initial channel is a starting point, calculate the difference value that begins from adjacent sub-carrier of the relevant receiving quality measurement result of other subcarriers respectively, generate also output and utilize the number of degrees (bit number of difference value) accordingly different to represent the differential received quality information of described difference value with the described request precedence of determining.
Figure 12 is the block diagram of the schematic configuration of the receiving quality information generating unit 1009 in the expression communication terminal 1000.Be imported into the average portion 1041 of receiving quality, subtraction portion 1043 and select generating unit 1044 from the receiving quality measurement result of each subcarrier of receiving quality determination part 308 output.The average portion 1041 of receiving quality belongs to the mean value (the receiving quality mean value of each channel) of the relevant receiving quality measurement result of whole subcarriers of each channel according to each channel calculation and output.Request degree determination portion 1042 is set up precedence to each channel, and is exported the precedence of each channel according to the good order of the receiving quality mean value of each channel of exporting from the average portion 1041 of receiving quality, promptly according to the order of distributing to the base station apparatus request.The difference value behind the accumulated value that deducts 1045 outputs of accumulation portion from the receiving quality measurement result of each subcarrier is calculated and exported in subtraction portion 1043.
Select generating unit 1044 about initial subcarrier, with L0 grade (the b0 bit that can represent in detail; B0 is a natural number) to after carrying out quantization from the receiving quality measurement result of receiving quality determination part 308 outputs, as non-differential received quality information output, about other subcarriers, precedence based on each channel of determining by request degree determination portion 1042, selection utilizes D1 differential received quality information, D2 differential received quality information, and which the differential received quality information in the D3 differential received quality information shows from each difference value of subtraction portion 1043 input, generates and the receiving quality information of each subcarrier that output is represented by the differential received quality information of selecting.And then, the kinds of information that is identified in the differential received quality information of selecting in each channel is appended in the described receiving quality information.In addition, also can add the information relevant with the request for allocation degree of each channel.And then, number group, that belong to the channel of each group of the channel of the D2 differential received quality information that the group of the channel that request for allocation degree that also can additional notifications D1 differential received quality information is the highest and notice request for allocation degree are time high.Accumulation portion 1045 selects under the situation of receiving quality information that generating unit 1044 generated and input and the non-differential received quality information that subcarrier is relevant at first in input, accumulated value is set at the represented value of this receiving quality information, under the situation of having imported the differential received quality information relevant with other subcarriers, the difference value that this differential received quality information is represented is added in the described accumulated value, and exports described accumulated value.
Figure 13 A and Figure 13 B are the flow charts of an example of the action that generates of the receiving quality information in expression receiving quality information generating unit 1009 (and receiving quality determination parts 308).Example in situation following shown in Figure 13 A and Figure 13 B: all the number of channel is Nch, included sub-carrier number is Nsc in each channel, generate D1 differential received quality information at M1 the channel that begins from the good side of receiving quality in whole channels according to the difference value that from the receiving quality measurement result of each subcarrier, deducts behind the accumulated value that accumulation portion 1045 exported, M2 channel at next generates D2 differential received quality information according to the described difference value in each subcarrier, generates D3 receiving quality information at remaining channel according to the described difference value in each subcarrier.And have, at this, M1 and M2 are for satisfying
(M1+M2)≤Nch
Positive integer.
Below, adopt Figure 13 A and Figure 13 B to generate being described in detail of action to receiving quality information.At first, utilize from the frequency pilot sign of separating 306 outputs of mapping portion and measure and export receiving quality (step S1301) each subcarrier.Secondly, calculate the mean value (the receiving quality mean value of each channel) (step S1302) of the relevant receiving quality measurement result of whole subcarriers of belonging to each channel according to each carrier wave, each channel is set up precedence (step S1303) according to the order that the receiving quality mean value of each channel that calculates is good.Secondly, carry out following processing (circulation 2 of step S1304～S1316) repeatedly at each channel, and then wherein each subcarrier is carried out following processing (circulation 3 of step S1305～step S1315) repeatedly.
(step S1306: "Yes") under the situation of first subcarrier of first channel (initial subcarrier), the receiving quality measurement result quantum that initial subcarrier is relevant turns to output (step S1307) after the receiving quality information of L0 grade, and this quantization result is set at accumulated value Dsum (step S1308).
At other subcarriers (j, k) ≠ (1,1) (step S1306: "No") under the situation, calculating is from subcarrier (j, k) deduct the difference value Ddiff (step S1309) after the accumulated value Dsum in the receiving quality measurement result, and the described precedence of j channel, the number M 1 that generates the channel of D1 differential received quality information, the number M 2 that generates the channel of D2 differential received quality information are compared (step S1310).
In step S1310, the precedence of j channel the M1 position with interior situation under, from D1 differential received quality information, select and output expression and subcarrier (j, k) the differential received quality information (step S1311) of the relevant immediate value of difference value Ddiff Dcqi.In addition, precedence at the j channel is under the situation of (M1+1) position～(M1+M2) position, from D2 differential received quality information, select and output expression and subcarrier (j, k) the differential received quality information (step S1312) of the relevant immediate value of difference value Ddiff Dcqi.In addition, in the precedence of j channel under the situation below (M1+M2+1) position, from D3 differential received quality information, select and output expression and subcarrier (j, k) the differential received quality information (step S1313) of the relevant immediate value of difference value Ddiff Dcqi.The value Dcqi that the differential received quality information of selecting is represented is added to accumulated value Dsum upward (step S1314).
Figure 14 is the generation result's of the receiving quality information of expression in the present embodiment the figure of an example.The example of following situation shown in Figure 14: promptly, utilize D1 differential received quality information, D2 differential received quality information and the D3 differential received quality information shown in the example of Fig. 9 B as receiving quality information, all the number of channel is 8 (Nch=8), included sub-carrier number is 4 in each channel, the number of channel of report D1 differential received quality information is made as 2 (M1=1), the number of channel of report D2 differential received quality information is made as 2 (M2=2), therefore reports that the number of channel of D3 differential received quality information is 4 (Nch-M1-M2=4).
In Figure 14, the dotted line in the chart is illustrated in the receiving quality measurement result that determines in the receiving quality determination part 308, is SINR (longitudinal axis in left side), and chain-dotted line is represented the mean value of the receiving quality measurement result relevant with whole subcarriers in each channel.In addition, the accumulated value (longitudinal axis on right side) in solid line each subcarrier of representing to be generated.
Set up according to the order of carrying out each channel by the good order of the receiving quality mean value in each channel shown in this chain-dotted line, the receiving quality measurement result quantum that initial subcarrier is relevant turns to output (in the example of Figure 14, L0=16, b0=4, receiving quality information are 6) after the receiving quality information of L0 grade (b0 bit).About other subcarriers, at the channel under each subcarrier in the M1 position with interior, be primary channel 4 and deputy channel 5, generate D1 differential received quality information, at (M1+1) position～(M1+M2) position, be tertiary channel 2 and the 4th 's channel 1, generate D2 differential received quality information, at following each channel (channel 3, channel 6, channel 7 and channel 8) in other (M1+M2+1) position, generate D3 differential received quality information.
In the example of Figure 14, generating required bit number 128 bits (the receiving quality information several 4 of sub-carrier number 4 in the number of channel 8 * channel * each subcarrier) under the situation of receiving quality information of whole subcarriers with respect to the receiving quality information of utilizing the L0 grade, is 58 bits in the present embodiment.In addition, with respect to only with the relevant situation that generates receiving quality information of channel of the good stated number of receiving quality, comprise the relevant receiving quality information of whole subcarriers in the present embodiment with whole channels.
Thus, in the present embodiment, from communication terminal 1000 during to base station apparatus 900 notice receiving quality information, according to the relative importance value (request degree) of communication terminal 1000, notify the information of the expression receiving quality measurement result relevant with the initial subcarrier of initial channel to the channel of the distribution of base station apparatus 900 request down links; About other subcarriers, select: adopt by the D1 grade information of expression receiving quality and the D1 differential received quality information that the difference value between the adjacent sub-carrier shows are notified, perhaps adopt by the D2 grade D2 differential received quality information that above-mentioned difference value shows is notified, perhaps adopt by the D3 grade D3 differential received quality information that above-mentioned difference value shows is notified.
Thus, about included from M the channel that begins for the best side of communication terminal 1000 receiving qualities in down link, be M1 the high channel of relative importance value that communication terminal 1000 distributes to base station apparatus 900 requests, notice D1 differential received quality information, wherein, this D1 differential received quality information is to utilize a lot of number of degrees at length to the information of the receiving quality of representing each subcarrier in this channel and the information that the difference value between the adjacent sub-carrier is represented.Thus,, under the situation that this communication terminal 1000 distributes from a described M1 channel, can carry out effective channel (Resource Block wherein) and distribute and Adaptive Modulation at base station apparatus 900, and can realize the more transmission of high speed.
And then, when the scheduling result of base station apparatus 900 is can't be when communication terminal 1000 distributes best described M1 the channel of for communication terminal 1000 receiving quality in the down link, about next M2 good channel of receiving quality of a described M1 channel, be secondly M2 the high channel of relative importance value of request distribution of a described M1 channel, by prenoticing D2 differential received quality information, under the situation of from a described M2 channel, distributing at 900 pairs of these communication terminals of base station apparatus, 1000 a replacement described M1 channel, though the efficient of channel allocation and Adaptive Modulation reduces also lowlyer than D1 differential received quality information, but but can cut down the amount of information of receiving quality information, wherein, this D2 differential received quality information is to utilize the number of degrees lacked than D1 differential received quality information to come the information of the receiving quality of representing each subcarrier in this channel and the information that the difference value between the adjacent sub-carrier is represented with moderate level of detail.
On the other hand, when the scheduling result of base station apparatus 900 is can't be when communication terminal 1000 distributes receiving quality is good for communication terminal 1000 described M1 channels and described M2 channel in the down link, about other channels, by prenoticing D3 differential received quality information, even under the situation that 900 pairs of these communication terminals 1000 of base station apparatus distribute from the channel except the channel of a described M1 channel and described M2, also can at utmost cut down the amount of information of receiving quality information, and can guarantee to transmit by rough Adaptive Modulation, wherein, this D3 differential received quality information is to utilize the number of degrees also lacked than D2 differential received quality information roughly to the information of the receiving quality of representing each subcarrier in each channel and the information that the difference value between the adjacent sub-carrier is represented.
More than, according to present embodiment, though can suppress from the receiving quality notification of information amount of information in the up link of communication terminal, but in the data communication of down link, under the situation of the channel that the request for allocation degree in being assigned communication terminal is high, can carry out based on the efficient scheduling of the detailed receiving quality information in the communication terminal and the high-speed communication under the Adaptive Modulation, even under the situation of the channel that the request for allocation degree in the allocate communications terminal installation of having to is low, also can be suitable for scheduling and Adaptive Modulation based on the rough receiving quality information in the communication terminal.
(the 3rd execution mode)
Below, the 3rd execution mode of the present invention is described.Figure 15 and Figure 16 are respectively the base station apparatus 1500 of expression in the present embodiment and the block diagram of the schematic configuration of communication terminal 1600.In the first embodiment, request for allocation degree according to the channel in the communication terminal 300 has been described, from following receiving quality information, select, with situation as the receiving quality information of the subcarrier in each channel: promptly, the L1 receiving quality information that adopts L1 grade showing by each subcarrier b1 bit that each receiving quality is represented, employing is by b2 bit (the L2 receiving quality information that L2 the grade of b2＜b1) show represented each receiving quality, with adopt by b3 bit (the L3 receiving quality information that L3 the grade of b3＜b2) show represented each receiving quality.In addition, in second execution mode, request for allocation degree according to the channel in the communication terminal 1000 has been described, has selected the information of the expression receiving quality measurement result relevant, with receiving quality information as the subcarrier in each channel with the initial subcarrier of initial channel; About other subcarriers, from following differential received quality information, select, with receiving quality information as the subcarrier in each channel: promptly, adopt D1 grade showing by b1 ' bit to the information of expression receiving quality and D1 differential received quality information that the difference value between the adjacent sub-carrier is represented, D3 grade adopting D2 differential received quality information that D2 grade being showed by b2 ' bit represent above-mentioned difference value and employing to show D3 differential received quality information that above-mentioned difference value is represented by b3 ' bit.
Communication terminal 1600 in the present embodiment is according to the request for allocation degree of each channel, adopt different frequencies to come non-differential received quality information and differential received quality information are carried out combination selection, with as with the relevant receiving quality information of subcarrier in each channel, wherein, this non-differential received quality information is the information of expression receiving quality measurement result, and this differential received quality information is to the information of expression receiving quality and the information that the difference value between the adjacent sub-carrier is represented.In the functional block of base station apparatus 1500 in the present embodiment, the receiving quality information storage part 1513 suitable with the receiving quality information storage part 913 of base station apparatus 900 is different with second execution mode.In addition, the receiving quality information generating unit 1609 that the receiving quality information generating unit 1009 of the communication terminal in the present embodiment 1600 and communication terminal 1000 is suitable is different with second execution mode.Other structures of base station apparatus and communication terminal are identical with second execution mode (Figure 10, Figure 11), its explanation of Therefore, omited.
In base station apparatus shown in Figure 15 1500, receiving quality information storage part 1513 is based on separating the receiving quality information by each communication terminal notice that mapping portion 211 separates, with notice this relevant non-differential received quality information of each subcarrier of non-differential received quality information being arranged is starting point, by having the relevant pairing difference value of this differential received quality information of each subcarrier of differential received quality information to carry out addition to notice successively, restore the information of the relevant receiving quality of each subcarrier of expression, store according to each communication terminal, and to 214 outputs of scheduling portion.
In addition, in communication terminal shown in Figure 16 1600, receiving quality information generating unit 1609 is determined the request precedence of each channel based on the receiving quality measurement result from each subcarrier of receiving quality determination part 308 outputs, select to notify the subcarrier of non-differential received quality information according to the request precedence of each channel, about notifying the subcarrier of these non-differential received quality information, the information that generates expression receiving quality measurement result is used as non-differential received quality information, about the subcarrier except that above-mentioned, with described non-differential received quality information is starting point, calculate relevant receiving quality measurement result of this subcarrier and the difference value between the adjacent sub-carrier respectively, generate and export the differential received quality information of utilizing the number of degrees of lacking than non-differential received quality information (bit number of difference value) to represent described difference value.
Figure 17 is the block diagram of the schematic configuration of the receiving quality information generating unit 1609 in the expression communication terminal 1600.Be imported into average portion 1041 of receiving quality and the subtraction portion 1643 from the receiving quality measurement result of each subcarrier of receiving quality determination part 308 output.The average portion 1041 of receiving quality belongs to the mean value (the receiving quality mean value of each channel) of the relevant receiving quality measurement result of whole subcarriers of each channel according to each channel calculation and output.Request degree determination portion 1042 is set up precedence to each channel, and is exported the precedence of each channel according to the good order of the receiving quality mean value of each channel of exporting from the average portion 1041 of receiving quality, the order of promptly distributing to the base station apparatus request.The difference value behind the accumulated value that deducts 1645 outputs of accumulation portion from the receiving quality measurement result of each subcarrier is calculated and exported in subtraction portion 1643.
Select the precedence of generating unit 1644 based on each channel of in request degree determination portion 1042, determining, which select to notify and the relevant receiving quality measurement result of each subcarrier in the channel with in non-differential received quality information and the differential received quality information, about the subcarrier of selecting to notify with non-differential received quality information, L0 the grade that employing is showed by b0 bit (b0 is a natural number) is to carrying out from the receiving quality measurement result of receiving quality determination part 308 outputs after the quantization as receiving quality information (below, be called " L0 receiving quality information ") output.In addition, about the subcarrier of selecting to notify, generate and export the D0 differential received quality information of D0 grade that employing is showed by b0 ' bit (satisfying the natural number of b0 '＜b0) to representing from each difference value of subtraction portion 1643 inputs with the differential received quality information.And then, the kinds of information of discerning the differential received quality information of selecting in each channel is appended on the described receiving quality information.In addition, also can add the information relevant with the request for allocation degree of each channel.
Import the receiving quality information of selecting generating unit 1644 generations and importing under the situation of non-differential received quality information, accumulation portion 1645 is set at the represented value of this non-differential received quality information with accumulated value, under the situation of having imported the differential received quality information, accumulation portion 1645 difference value that this differential received quality information is represented is added in the described accumulated value, and exports described accumulated value.
Figure 18 A and Figure 18 B are the flow charts of an example of the action that generates of the receiving quality information in expression receiving quality information generating unit 1609 (and receiving quality determination parts 308).In Figure 18 A and Figure 18 B, all the number of channel is Nch, the included sub-carrier number of each channel is Nsc, at M1 the channel that well begins from receiving quality in whole channels, subcarrier every T1 is generated L0 receiving quality information, at subcarrier in addition,, generate D0 differential received quality information according to the difference value behind the accumulated value that from the receiving quality measurement result of each subcarrier, deducts 1645 outputs of accumulation portion.In addition, show the example of following situation: at M2 the channel of next, subcarrier every T2 is generated L0 receiving quality information, at subcarrier in addition, generate D0 differential received quality information according to the described difference value in each subcarrier,, the subcarrier every T3 is generated L0 receiving quality information at remaining channel, at subcarrier in addition, generate D0 differential received quality information according to the described difference value in each subcarrier.And have, at this, M1 and M2 are for satisfying
(M1+M2)≤Nch
Positive integer.
Below, utilize Figure 18 A and Figure 18 B to generate being described in detail of action to receiving quality information.First-selection is utilized from the frequency pilot sign of separating 306 outputs of mapping portion and is measured and export receiving quality (step S1801) each subcarrier.Secondly, belong to the mean value (the receiving quality mean value of each channel) (step S1802) of the relevant receiving quality measurement result of whole subcarriers of each channel according to each channel calculation, each channel is set up precedence (step S1803) according to the order that the receiving quality mean value of each channel that calculates is good.Secondly, each channel is carried out following processing (circulation 4 of step S1804～step S1817) repeatedly.
The relatively described precedence of j channel and number M 1, the M2 (S1805) of described channel, the precedence of j channel the M1 position with interior situation under, the interval T that generates the subcarrier of L0 receiving quality information is made as T1 (step S1806).In addition, be under the situation of (M1+1) position～(M1+M2) position in the precedence of j channel, the interval T that generates the subcarrier of L0 receiving quality information is made as T2 (step S1807).In addition, under the following situation in (M1+M2+1) position, the interval T of the subcarrier of generation L0 receiving quality information is made as T3 (step SS1808) in the precedence of j channel.And then, in the circulation of each channel, each subcarrier is carried out following processing (circulation 5 of step S1809～step S1816) repeatedly.
K subcarrier (j at the j channel, k) in channel, be positioned under the situation of subcarrier every T (remainder of k after divided by T is 0) (step S1810 is a "Yes"), with subcarrier (j, k) Xiang Guan receiving quality measurement result quantum turns to the output (step S1811) after the quality information of accepting of L0 grade, and this quantization result is set at accumulated value Dsum (step S1812).Under the situation of other subcarriers (remainder of k after divided by T is the number beyond 0) (step S1810 is a "No"), calculating is from subcarrier (j, k) deduct the difference value Ddiff (step S1813) behind the accumulated value Dsum in the receiving quality measurement result, selection and output expression and the immediate differential received quality information (step S1814) that is worth Dcqi of described difference value Ddiff from D0 differential received quality information, the value Dcqi that the differential received quality information of selecting is represented is added to accumulated value Dsum upward (step S1815).
Figure 19 is the generation result's of the receiving quality information of expression in the present embodiment the figure of an example.The example of following situation shown in Figure 19: utilize by 16 grade (L0=16, b0=4) carry out L0 receiving quality information after the quantization as non-differential received quality information to receiving the quality determination result, will with the D2 differential received quality information (D0=4 shown in the example of Fig. 9 B, b0 '=2) identical information is used as the differential received quality information as D0 differential received quality information, for whole numbers of channel is 8 (Nch=8), the included sub-carrier number of each channel is 4, cut apart high 2 channels (M1=2) of request degree, with whole subcarrier notice L0 receiving quality information (T1=1), then for high 2 channels (M2=2) of request for allocation degree, according to per 2 subcarriers notice L0 receiving quality information (T2=2), for remaining 4 channels (Nch-M1-M2=4), according to per 4 subcarriers notice L0 receiving quality information (T3=4).
Dotted line in Figure 19 table is illustrated in the receiving quality measurement result that determines in the receiving quality determination part 308, is SINR (longitudinal axis in left side), and chain-dotted line is represented the mean value of the receiving quality measurement result relevant with whole subcarriers in each channel.In addition, L0 receiving quality information or the accumulated value (longitudinal axis on right side) in solid line each subcarrier of representing to be generated.According to by the good order of the receiving quality mean value in each channel shown in this chain-dotted line to each channel foundation order, in the M1 position with interior, be in primary channel 4 and the deputy channel 5, whole subcarriers are generated L0 receiving quality information.In addition, in (M1+1) position～(M1+M2) position, promptly in the 3rd bit channel 2 and the 4th bit channel 1, the first and the 3rd subcarrier is generated L0 receiving quality information, and generating with the difference value between the first and the 3rd subcarrier and the L0 receiving quality information respectively for the second and the 4th subcarrier is the D0 differential received quality information that the basis is selected.In addition, in each channel (channel 3, channel 6, channel 7 and channel 8) below other (M1+M2+1) position, first subcarrier is generated L0 receiving quality information, for second to the 4th subcarrier generate with and adjacent sub-carrier in accumulated value (in second subcarrier, becoming the L0 receiving quality information of first subcarrier) between difference value serve as the basic D0 differential received quality information of selecting.
In the example of Figure 19, generating bit number 128 bits required under the situation of receiving quality information of whole subcarriers (the receiving quality information bit 4 of sub-carrier number 4 in the number of channel 8 * channel * each subcarrier) with respect to the receiving quality information with the L0 grade, is 96 bits in the present embodiment.In addition, with respect to the situation that only generates receiving quality information, in the present embodiment, comprise the relevant receiving quality information of whole subcarriers of whole channels about the channel of the good stated number of receiving quality.
Thus, according to present embodiment, from communication terminal 1600 during to base station apparatus 1500 notice receiving quality information, according to the relative importance value (request degree) of communication terminal 1600 to the channel of the distribution of base station apparatus 1500 request down links, select to notify the subcarrier of non-differential received quality information, about notifying the subcarrier of these non-differential received quality information, the information of notice expression receiving quality measurement result is as non-differential received quality information.In addition, about subcarrier in addition, with described non-differential received quality information is starting point, calculate relevant receiving quality measurement result of this subcarrier and the difference value between the adjacent sub-carrier respectively, and notice is utilized than non-difference and is accepted the differential received quality information that number of degrees (bit number of difference value) that quality information lacks is represented described difference value.
Thus, about included from M the channel that begins for the best side of communication terminal 1600 receiving qualities in down link, be M1 the high channel of relative importance value that communication terminal 1600 distributes to base station apparatus 1500 requests, by increasing the sub-carrier number of notifying by the L0 receiving quality information of utilizing a lot of number of degrees at length the information of expression receiving quality to be represented, at base station apparatus 1500 under the situation that this communication terminal 1600 distributes from a described M1 channel, can carry out effective channel (Resource Block wherein) and distribute and Adaptive Modulation, and can realize the more transmission of high speed.
And then, when the scheduling result of base station apparatus 1500 is can't be when communication terminal 1600 distributes best described M1 the channel of for communication terminal 1600 receiving quality in the down link, about next M2 good channel of receiving quality of a described M1 channel, be secondly M2 the high channel of relative importance value of request distribution of a described M1 channel, reducing notifies the sub-carrier number of described L0 receiving quality information that it is also lacked than a described M1 channel, for remaining subcarrier, notice utilize the number of degrees of lacking than L0 receiving quality information come to and adjacent sub-carrier between the D0 differential received quality information represented of difference value.Thus, under the situation of from a described M2 channel, distributing at 1500 pairs of these communication terminals of base station apparatus, 1600 a replacement described M1 channel, though the efficient of channel allocation and Adaptive Modulation reduces also lowlyer than a described M1 channel, but can cut down the amount of information of receiving quality information.
On the other hand, when the scheduling result of base station apparatus 1500 is can't be when communication terminal 1600 distributes receiving quality is good for communication terminal 1600 described M1 channels and described M2 channel in the down link, about other channels, also deduct the sub-carrier number of notifying described L0 receiving quality information, for remaining subcarrier, adopt the difference value between described D0 differential received quality information notice and the adjacent sub-carrier.Thus, even under the situation that 1500 pairs of these communication terminals 1600 of base station apparatus distribute from the channel except the channel of a described M1 channel and described M2, also can at utmost cut down the amount of information of receiving quality information, and can guarantee to transmit by rough Adaptive Modulation.
More than, according to present embodiment, though can suppress from the receiving quality notification of information amount of information in the up link of communication terminal, but in the data communication of down link, under the situation of the channel that the request for allocation degree in being assigned communication terminal is high, can carry out based on the efficient scheduling of the detailed receiving quality information in the communication terminal and the high-speed communication under the Adaptive Modulation, in addition, even under the situation of the channel that the request for allocation degree in the allocate communications terminal installation of having to is low, also can be suitable for scheduling and Adaptive Modulation based on the rough receiving quality information in the communication terminal.In addition, accepting under the quality determination result situation jumpy, if only notify difference value, then cumulative errors can increase, but according to the present invention, owing to notify so-called initial data, so can reduce the influence of cumulative errors.
And have, in the present embodiment, example to the sub-carrier number of selecting the non-differential received quality information (L0 receiving quality information) in the notification channel according to the request for allocation degree of each channel is illustrated, but also can take following structure: the number of degrees (bit number) of also selecting the differential received quality information that generates about remaining subcarrier.
(the 4th execution mode)
In each above-mentioned execution mode, illustrated that hypothesis ofdm system and channel mean the situation of one or more subcarriers.In the present embodiment, about an example of the usability methods in MIMO (Multiple InputMultiple Output)-ofdm system, illustrate respectively one or more subcarriers of each transmitting antenna situation as channel.
Figure 20 is the figure of an example of the subframe structure of the down link of expression in the present embodiment.Base station apparatus sends different signals by the transmitting antenna of A root (A is the integer more than 2).Subframe comprises each A that sends zone from antenna 1 to antenna A, and each zone further is split into K (K is a natural number) zone on frequency direction.With this A * K zone respectively as channel, with this subframe as sending unit, with it as the scope of in a scheduling processing, carrying out channel allocation.In addition, subframe is divided into T (T is a natural number) with the long TTI of official hour (Transmission Time Interval) on time-axis direction, with in the 1TTI in 1 channel as thread (resource is fast).
Thus, in the MIMO-OFDM of this subframe structure system, the zone that the such term of channel or Resource Block is represented is different, so can be suitable for the processing identical with the respective embodiments described above.
More than, in the system that a plurality of channels in utilizing subframe communicate, certain different system of receiving quality possibility for each channel in each communication terminal, the present invention can be suitable for, by selecting the level of detail and the amount of information of the receiving quality information under the up link according to the request for allocation degree of each channel in the communication terminal, thereby can be suitable for efficient scheduling and Adaptive Modulation.
As described above, have in the respective embodiments described above in the cellular system of following characteristics, utilize the SINR that calculates based on frequency pilot sign the present invention to be described as receiving quality;
(1) with transfer system as multicarrier transfer system (particularly, OFDM transfer system);
(2) with channel architecture as the structure that possesses at least one subcarrier;
(3) with the unit of receiving quality information and Adaptive Modulation as each subcarrier;
(4) with adaptive scheduling (channel allocation) as each channel or fast as each resource that channel is cut apart on time orientation.
But, the unit of the modulation system that the present invention can be suitable for, channel architecture, receiving quality information and Adaptive Modulation, adaptive scheduling (channel allocation), and receiving quality be not limited to above-mentioned.For example, to utilize MC-CDMA (the Multi Carrier-Code DivisionMultiple Access) system of expanding technology as transfer system, the unit that carries out Adaptive Modulation and adaptive scheduling is at MIMO SDMA such as (Multiple Input Multiple Output) (Space DivisionMultiple Access: a plurality of channels that transmitting antenna or natural mode are represented the polynary access of empty branch), a plurality of Code Channel among the CDMA, or as channel of these combinations etc., even the other system that utilizes a plurality of channels to communicate, in system that may be different according to each channel receiving quality, the present invention also can be suitable for.
In addition, as receiving quality information, can utilize RSSI (Received Signal StrengthIndicator), SNR, SIR (Signal to Interference power Ratio: received signal power is to noise power ratio), CNR (Carrier to Noise power Ratio: carrier power is to noise power ratio), CIR (Carrier to Interference power Ratio: carrier power is to noise power ratio), the index of the expression receiving quality relevant of CINR (Carrier to Interference plus Noise power Ratio: carrier power is to interference power and noise power ratio) etc. with received signal power or carrier power.In addition, as this index, so long as the combination of modulation system and channel encoding rate, the relevant index of transfer rates such as modulation parameter promptly selected according to the transmission path state of modulation parameter of MCS (Modulation and Coding Scheme) or transfer rate etc. etc. just can be any index.In addition, the unit of receiving quality information or Adaptive Modulation also can be each sub carrier group that is made of the more than one subcarrier in the channel.
In addition, in the respective embodiments described above, although clear situation to whole channel notification receiving quality information, but also can take following structure: about the group of the minimum channel of channel assignment request degree, do not notify the most rough receiving quality information (the L3 receiving quality information in the respective embodiments described above, D3 differential received quality information etc.), perhaps only notify the mean value of described receiving quality.
And then, in the respective embodiments described above, though the precedence with each channel is established as benchmark, utilize the example of mean value of the receiving quality measurement result of the subcarrier in the channel to be illustrated, but be not limited thereto, can be benchmark also, carry out the precedence of each channel and set up with intermediate value, mode or the minimum value etc. of the receiving quality measurement result of the subcarrier in the channel.In addition, in the respective embodiments described above, though to as receiving quality information and the receiving quality information of representing with the combination of 3 kinds of different bit numbers or 3 kinds of non-differential received quality information of difference and differential received quality information be illustrated, but for the communication terminal of the receiving quality information of being selected by the request for allocation degree of channel to be represented by different bit numbers more than 2 kinds or described combination, the present invention also is suitable for.
In addition, in each above-mentioned execution mode, though be employing FDD (the Frequency Division Duplex: communication system frequency division multiplexing) that constitutes by base station apparatus and communication terminal, hypothesis OFDM adaptive modulation system in the communication of down link, and hypothesis OFDM and do not carry out the system of Adaptive Modulation in the communication of up link still is not limited thereto.And then, the present invention can be applicable to a plurality of radio communication devices any one can both implement scheduling feature and Adaptive Modulation, and other radio communication devices can be implemented the receiving quality message sending function, relevant radio communication device each other.
And have, in two radio communication devices, though to the side (a side) of the receiving quality information of notification channel with receiving quality message sending function as communication terminal, and transmission data from each communication terminal to each channel allocation that send toward of the receiving quality information that will come based on notice and a side (carrying out a side of scheduling feature) of carrying out Adaptive Modulation be illustrated as base station apparatus, but also exist a radio communication device to have the situation of two aspect functions.
In this manual, communicator is the device that carries out radio communication, comprises base station apparatus, communication terminal, wireless machine, portable communication terminal device and mobile phone etc.

Claims (10)

1. communicator, be applicable to the multi-carrier communication mode, wherein, in described multi-carrier communication mode, the channel that is distributed by communication counterpart in a plurality of channels that employing is made of at least one subcarrier comes received signal, and measure the receiving quality of the signal receive, and then receiving quality information is notified to described communication counterpart
Described communicator possesses:
The receiving quality determination part, it measures the receiving quality of each subcarrier; With
Receiving quality information generating unit, it determines the request for allocation degree of the described relatively communication counterpart of each channel, select to be used to represent the amount of information of receiving quality information based on described request for allocation degree according to each channel, and generate the described receiving quality information of representing by the described amount of information of selecting based on the measurement result of described receiving quality.
2. communicator according to claim 1 is characterized in that,
Described receiving quality information generating unit possesses:
Request degree determination portion, it determines the request for allocation degree of the described relatively communication counterpart of each channel based on the described receiving quality that determines; With
Select generating unit, it selects to be used to represent the amount of information of receiving quality information according to each channel based on described request for allocation degree, and according to each sub carrier group, measurement result based on described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel.
3. communicator according to claim 2 is characterized in that,
Described receiving quality information generating unit possesses the average portion of receiving quality, and one of them in mean value, intermediate value, mode or the minimum value of receiving quality measurement result of the whole subcarriers that belong to each channel calculated by the average portion of described receiving quality,
The value of described mean value, intermediate value, mode or minimum value is high more, and described request degree determination portion improves the request for allocation degree of described each channel more.
4. according to claim 2 or 3 described communicators, it is characterized in that,
The high channel of described request for allocation degree, described selection generating unit generates the big more receiving quality information of amount of information.
5. communicator according to claim 4 is characterized in that,
Described selection generating unit just improves the mode of the bit number of each sub carrier group more according to channel that described request for allocation degree is high, generates according to described bit number and the measurement result of described receiving quality is carried out receiving quality information after the quantization.
6. communicator according to claim 4 is characterized in that,
As described receiving quality information, described selection generating unit generates non-differential received quality information at predetermined at least one sub carrier group, generate the differential received quality information at other sub carrier group, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of described receiving quality; Described differential received quality information is represented the measurement result of described receiving quality and the information of the difference value between the adjacent sub-carrier group for the high more mode of many more bit numbers of just utilizing of request for allocation degree according to affiliated channel.
7. communicator according to claim 4 is characterized in that,
As described receiving quality information, described selection generating unit generates non-differential received quality information and differential received quality information at described each sub carrier group, wherein, described non-differential received quality information is for carrying out the information after the quantization to the measurement result of described receiving quality; Described differential received quality information is the measurement result of the described receiving quality of expression and the information of the difference value between the adjacent sub-carrier group,
The high channel of described request for allocation degree is just got over the sub carrier group that more options generate described non-differential received quality information.
8. communicator according to claim 7 is characterized in that,
Described selection generating unit makes the bit number of the described differential received quality information of expression also lack than the bit number of representing described non-differential received quality information.
9. a multi-carrier communications systems is made of communication control unit and communication terminal, wherein, described communication control unit from a plurality of channels that constitute by at least one subcarrier to described communication terminal allocated channel; Described communication terminal adopts the channel that is distributed by described communication control unit to come received signal, and measures the receiving quality of the signal that receives, and then receiving quality information is notified to described communication control unit,
Described communication terminal is measured the receiving quality of each subcarrier, determine the request for allocation degree of the described relatively communication control unit of each channel, select to be used to represent the amount of information of receiving quality information according to each channel based on described request for allocation degree, and according to each sub carrier group, measurement result based on described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, notify the receiving quality information of described generation to described communication control unit, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel.
10. communication means, it is the communication means of the multi-carrier communications systems that constitutes by communication control unit and communication terminal, wherein, described communication control unit from a plurality of channels that constitute by at least one subcarrier to described communication terminal allocated channel; Described communication terminal adopts the channel that is distributed by described communication control unit to come received signal, and measures the receiving quality of the signal that receives, and then to described communication control unit notice receiving quality information,
In described communication terminal,
Measure the receiving quality of each subcarrier, determine the request for allocation degree of the described relatively communication control unit of each channel,
Select to be used to represent the amount of information of receiving quality information based on described request for allocation degree according to each channel,
According to each sub carrier group, based on the measurement result of described receiving quality, generate the described receiving quality information of representing by the described amount of information of selecting, wherein, described sub carrier group is made of at least one subcarrier that belongs to each channel,
Notify the receiving quality information of described generation to described communication control unit.
CN200880112914A 2007-10-25 2008-10-08 Communication device, multicarrier communication system, and communication method Pending CN101836386A (en)

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JP2007277443 2007-10-25
JP2007-277443 2007-10-25
PCT/JP2008/068273 WO2009054264A1 (en) 2007-10-25 2008-10-08 Communication device, multicarrier communication system, and communication method

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